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Texas Instruments SN74LVTH241DW

These octal buffers/drivers are designed
specifically for low-voltage (3.3-V) VCC operation,
with the capability to provide a TTL interface to a
5-V system environment.

The LVTH241 devices are organized as two 4-bit
line drivers with separate output-enable (1OE\,
2OE) inputs. When 1OE\ is low or 2OE is high, the
devices pass noninverted data from the A inputs
to the Y outputs. When 1OE\ is high or 2OE is low,
the outputs are in the high-impedance state.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors
with the bus-hold circuitry is not recommended.

When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down.
However, to ensure the high-impedance state above 1.5 V, OE\ should be tied to VCC through a pullup resistor
and OE should be tied to GND through a pulldown resistor; the minimum value of the resistor is determined by
the current-sinking/current-sourcing capability of the driver.

These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry
disables the outputs, preventing damaging current backflow through the devices when they are powered down.
The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down,
which prevents driver conflict.